Denis ahern



(No Model.)

D. AHERN.

. STEAM 13011.55. No. 528,409;

Patented Oct. 30, 1894.

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` DENIS AHERN, F

`ATENT Trios.

NEW YORK, N. Y.

STEAM-BOILER.

SPECIFICATION-forming part of Letters Patent No. 528,409, dated October30, 1894:.v

l Application led May 2, 1894.. Serial No. 509,859. (No model.)

To al? whom t may concern:

Be 1t known that I, DENIS AHERN, a citizen of the United States,residing in the city and county of New York, in the State of New York,have invented a certain new and useful Imiprovement in and Relating toSteam-Boilers, of which the following is a specification.

For serving in steam vessels, I arrange two 0r more of my boilersextending fore and aft on opposite sides of the center line of thevessel, and fire each from a suicient space left between. My boilers arepeculiarly adapted to serve in such situations. They may also be usedwith advantage for general purposes.

I adopt in part a construction which has Y been tried and much approved.Eachboiler 1s composed of a main body of rectangular cross-section,traversed by two series of tubes at right angles to each other. The bodyis set partiallydiamond-wise,and is equipped with a water-leg extendingdownward from the lower angle, which latter is tied with efficientinternal braces or gussets. The furnace is on one side, the front sideof this water-leg. The hot products of combustion rise through oneinclined set of pipes, descend in a sufficient chamber on the sideopposite to the Iire and pass into the up-take through the tubes whichare inclined in the opposite direction. A cylindrical drum extendshorizontally near the upperangle of thebody, with liberal connections. Iprovide removable means for stopping the flow of the hot gases throughthe space between the body and the drum. I prof vide a liberalconnection to the stack so as to present the nearly spent heat to oneside of. the steam-drum. The arrangement insures a just sufficient heatin theupper portion of the apparatus to dry the steam Without injuringthe metal. The water-leg is set inclined, which arrangementincreases theprovision for grate area.

The front of the boiler is composed of tubes and headers so connected tothe boiler that there shall be an active circulation through the whole.

The accompanying drawings form a part of this specification andrepresent what I consider the best means of carrying out the invention.

Figure 1 is a transverse vertical section through one boiler with aportion of the vessel. This figure shows also the line of the front of asimilar boiler, which it will be understood is placed in the reversedposition on the otherside of the hull. Fig. 2 is an elevation of theboiler shown in Fig. l. The portion of this figure at the right showsthe exterior of the front. The middle portion shows the front platesremoved. 'lhe left portion shows the boiler with still more of the frontwork removed.

Similar letters of reference indicate corresponding parts in both thefigures where they appear.

A is the main body of the boiler, of rectangular cross-section, theproportion being about one and one-half(1) to one (l). It may be of anyrequired length.

A is a Water-leg extending downward from the lower angle at aninclination, as shown.

A2 are specially strong stays tying the parts together at the junctionof the water-leg with the boiler, butleaving liberal passages for thedescent of water and the ascent of steam.

B and C are the two sets of tubes, the first set, B, connecting thebroadest faces; the second and longer set, C, connecting the shorterfaces of the body.

' In steam-vessels I mount my boiler in pairs, each boiler presentingits face inward toward the center line of the vessel, the oppositeangle, which I will call the back or outer side, being presented'towardthe side M of the vessel. The body is set with its longer faces at anangle of about thirty (30) degrees from the horizontal. This carries theinclined water-leg so far to the backside or outside that it gives avery liberal space for the lire-grate.

D is a horizontal drum set a little above the upper angle, andcommunicating with the body by liberal connections D. The side angles ofthe body are 'strengthened by gussets a3.

The grate E may extend the wholelength of the boiler, and theVconstruction allows it to be of liberal area. s

G, G, are horizontal thin strips or plates of iron, having the form ofcross-section represented, connected by bolts G and nuts G2. Theyprevent the passage of the hot gases IDO throtigh the space between theboiler A and the drum D, while allowing of easy removal to facilitatethe construction and repairs.

The boiler front is inclined, as shown, and composed of horizontal tubesH, connecting with headers Il', H2, the latter being provided withliberal connections to the body and to the leg to insure that the waterin the boiler is allowed to circulate through these tubes.

I are removable panels. These may be double or triple sheet iron, withair spaces between to retard the conduction of heat. They are secured atthe bottom by bolts I and rest at their upper edges against a ledge D2.There arebolts coniinin g these upper edges also removably. An efficientnon-conducting casing .I extends downward at the rear at a properdistance from the short lower rear face of the boiler. The spacesinclosed between the boiler body and the panels I and the casing .I leadthe hot gases downward after their delivery from the tubes B, and allowthem to rise through the tubes C into the up-take.

K is 'the stack, and K', K', a widening of the base thereof extendinglongitudinally of the boiler. A removable sheet or panel K2 completesthe inclosure of this face of the boiler. The stack K, with itsextensions K and sheet K2, is secured by bolts L to the boiler front,and by bolts L2 engaging with the ledge D2 on the drum D.

It will be understood that there may be any or all of the ordinaryaccompaniments of a boiler, as a safety-valve, water gages, andprovisions for feeding and nonconduct ing clothing outside of the frontand of the several other surfaces, arranged in any ordinary or suitablemanner. It will be understood that the pipes H and headers I-I areproperly covered, and the spaces between are filled with earthy ornon-conducting material, and the whole properly faced to make a tightand eflicient boiler front.

The weight of the boiler may be largely supported on the only moderatelyinclined water-leg. The lower portion of this latter extends below thegrate and serves as an efficient mud-drum, with provisions for blowingout or otherwise cleaning at intervals. Extensions A4 A4, from the outerangle connect the boiler to the adjacent parts and aid in their mutualsupport while allowing a liberal space betwen these extensions for thehot gases to descend.

I attach importance to the inclination of the front of the boiler,because it contributes to the effect induced by the inclination of thewater-leg A inthe opposite direction,-to in-V crease the area availablefor the fire-grate. The horizontal water pipes H in the front, and theprovisions for circulating water there through, add materially to theheating surface, and consequently to the efficiency of the boiler. Y

The front of the base panel K2 of the stack can be detached bydisconnecting two lines of bolts as shown to allow of access to thefront ends of the tubes C without disturbing the stack. i

Similarly the rear panel, I, can be removed by disconnecting the twolines of bolts to allow access to the back ends of the tubes B.

Modifications may be made without departing from the principle orsacrificing the advantages of the invention. `I can vary the relativeproportions and the inclinations ofthe sides of the body. The boiler mayserve with the cross-section of the body square, and mounted exactlydiamondwise, the lower angle being directly under the upper. I preferthe whole as shown. Y

I claim as my invention l. In a steam boiler having a rectangular body Aof oblong cross-section, set horizontal longitudinally and inclinedtransversely, an inclined water-leg A', extending continuously along thelength of the boiler, in combination with the grate E extended rearwardbeyond the center line of the body, and with the inclined furnace fronthaving horizontal tubes H and headers H connected to the body A, allarranged forjoint operation substantially as herein specified.

2. In a steam boiler having a rectangular body A and a separating drum Dextended horizontally a little above the upper angle, with connections Dtherefrom to the body, a removable strip G and holding means G', G2,adapted to prevent the flow of gases forward at the top, and to beeasily displaced when required, all substantially as herein specified.

3. In a steam boiler having a rectangular body A, set oblique orinclined transversely and traversed by two sets of tubes B and C atright angles each to the other, the inclosing casing, the upper portionof which is composed of the removable panels I, K2, adapted to beremoved to allow access to the tube ends for examination or repairswithout disturbing the other parts, and the drum D, and the stack Ksupported on such drum independently of such casing, all substantiallyas herein specified.

4. The boiler body A, set inclined transversely with the grate under oneoblique face, two sets of tubes inclined in opposite directions, theprovisions for the iow of gases downward past the rear angle of the bodyand upward again through the tubes (J, and the stack K leading upwardfrom the top chamber at the front and the removable panels I and K2, allarranged in the hull M of a vessel, and adapted to serve substantiallyas herein s'pecited.

In testimony that I claim the invention above set forth I affix mysignature in presence of two witnesses.

DENIS AHERN.

Vitnesses:

CHARLES R. SEARLE, M. F. BOYLE.

TOO

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